MC7824AECT Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The MC7824AECT is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed positive 24V output at 1A current capacity in a TO-220-3 through-hole package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The MC7824AECT delivers regulated 24V output from input voltages up to 40V with integrated over-temperature and short-circuit protection, suitable for industrial and embedded power management applications.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	24V
Output Current	1A
Input Voltage (Max)	40V
Voltage Dropout (Max)	2V @ 1A (Typ)
Quiescent Current	6 mA
PSRR	54dB (120Hz)
Protection Features	Over Temperature, Short Circuit
Operating Temperature Range	0°C ~ 125°C
Package / Case	TO-220-3
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution for the MC7824AECT is determined by the following critical parameters:

Output Voltage: Must be fixed at 24V
Output Current Capacity: Minimum 1A (higher ratings are acceptable for direct substitution)
Input Voltage Rating: Maximum 40V or higher
Package Type: TO-220-3 through-hole configuration
Protection Features: Over-temperature and short-circuit protection required
Output Configuration: Positive fixed output only

Substitute parts are grouped into two categories:

Parametric Equivalents (MC7824ACTG, MC7824CTG): Identical electrical specifications and output current rating (1A), same package, manufactured by onsemi with active product status.

Similar Substitutes (MC7824BTG, L7824 series, L78M24CV): Parts meeting core substitution criteria with variations in output current capacity, manufacturer, or operating temperature range. Higher current-rated devices (1.5A) provide backward compatibility. Lower current-rated devices (500mA) are suitable only for applications requiring ≤500mA.

Parameter Comparison

Part Number	Manufacturer	Output Current	Quiescent Current (Iq)	PSRR (120Hz)	Operating Temp Range	Product Status	RoHS Status
MC7824AECT	onsemi	1A	6 mA	54dB	0°C ~ 125°C	Obsolete	REACH Unaffected
MC7824ACTG	onsemi	1A	6 mA	61dB	0°C ~ 125°C	Active	ROHS3 Compliant
MC7824CTG	onsemi	1A	6.5 mA	61dB	0°C ~ 125°C	Active	ROHS3 Compliant
MC7824BTG	onsemi	1A	8 mA	61dB	-40°C ~ 125°C	Active	ROHS3 Compliant
L7824ABV	STMicroelectronics	1.5A	6 mA	54dB	-40°C ~ 125°C	Active	ROHS3 Compliant
L7824ABV-DG	STMicroelectronics	1.5A	6 mA	54dB	-40°C ~ 125°C	Active	ROHS3 Compliant
L7824ACV	STMicroelectronics	1.5A	6 mA	54dB	0°C ~ 125°C	Obsolete	ROHS3 Compliant
L7824CV	STMicroelectronics	1.5A	8 mA	50dB	0°C ~ 125°C	Active	ROHS3 Compliant
L7824CV-DG	STMicroelectronics	1.5A	8 mA	50dB	0°C ~ 125°C	Active	ROHS3 Compliant
MC78M24CTG	onsemi	500mA	—	70dB	0°C ~ 125°C	Obsolete	ROHS3 Compliant
L78M24CV	STMicroelectronics	500mA	6 mA	50dB	0°C ~ 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

First Choice - Parametric Equivalents (Direct Replacement):

MC7824ACTG and MC7824CTG are the preferred substitutes. Both are active products from onsemi with identical 1A output current, 24V fixed output, and TO-220-3 packaging. MC7824CTG offers the highest inventory availability (175,300 units) and maintains full electrical compatibility with the MC7824AECT. Both parts are ROHS3 compliant and REACH unaffected.

Secondary Choice - onsemi Active Alternative:

MC7824BTG provides active product status with extended operating temperature range (-40°C ~ 125°C) compared to the MC7824AECT (0°C ~ 125°C). Output current and voltage specifications remain identical at 1A and 24V. This part is suitable for applications requiring wider temperature operation.

Cross-Manufacturer Alternatives (Higher Current Rating):

L7824ABV, L7824ABV-DG, L7824CV, and L7824CV-DG from STMicroelectronics are active products with 1.5A output current capacity, providing margin above the 1A requirement. These parts maintain 24V fixed output and TO-220-3 packaging. L7824ABV and L7824ABV-DG support extended temperature range (-40°C ~ 125°C). All are ROHS3 compliant.

Lower Current Alternatives (500mA Output):

MC78M24CTG and L78M24CV are suitable only for applications with maximum current draw ≤500mA. These parts are not recommended as direct replacements for 1A-rated designs. L78M24CV is the active product option in this category.

Obsolete Parts to Avoid:

L7824ACV and MC78M24CTG carry obsolete product status and should not be selected for new designs despite potential availability.

Frequently Asked Questions (FAQ)

Q: Can I use a 1.5A-rated regulator (L7824 series) as a direct replacement for the 1A MC7824AECT?

A: Yes. Higher current-rated regulators are backward compatible with lower current requirements. The L7824 series (1.5A) will function identically in applications designed for 1A output, with improved current headroom for transient conditions.

Q: What is the difference between MC7824ACTG and MC7824CTG?

A: Both are parametric equivalents with identical 1A output current and 24V fixed output. MC7824CTG has marginally higher quiescent current (6.5 mA vs. 6 mA) and superior PSRR performance (61dB vs. 61dB). MC7824CTG offers significantly higher inventory availability. Either part is suitable for direct substitution.

Q: Why should I avoid the 500mA-rated parts (MC78M24CTG, L78M24CV)?

A: These parts are rated for maximum 500mA output current. The MC7824AECT is rated for 1A. Using a 500mA regulator in a 1A application will cause thermal shutdown or damage. Select 500mA parts only if your application current requirement is confirmed ≤500mA.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed (MC7824ACTG, MC7824CTG, MC7824BTG, L7824 series, L78M24CV) are ROHS3 compliant. The original MC7824AECT is REACH unaffected but not explicitly ROHS3 certified due to obsolete status.

Q: Does package type vary among substitutes?

A: All substitute parts use TO-220-3 through-hole packaging, identical to the MC7824AECT. Supplier device package designations (TO-220 vs. TO-220-3) refer to the same physical package with three leads. No PCB layout modifications are required.

Q: Which substitute offers the best availability?

A: MC7824CTG has the highest inventory (175,300 units) among parametric equivalents. L7824CV-DG offers the highest overall availability (125,100 units) among all substitutes, with 1.5A output current and active product status.

Q: Can I use MC7824BTG in applications requiring 0°C minimum operating temperature?

A: Yes. MC7824BTG supports -40°C ~ 125°C operating range, which exceeds the 0°C ~ 125°C requirement of the MC7824AECT. This part is suitable for all temperature profiles compatible with the original device.

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